人民币大写转换

function convertCurrency(currencyDigits) { // Constants:     var MAXIMUM_NUMBER = 99999999999.99;     // Predefine the radix characters and currency symbols for output:     var CN_ZERO = "零";     var CN_ONE = "壹";     var CN_TWO = "贰";     var CN_THREE = "叁";     var CN_FOUR = "肆";     var CN_FIVE = "伍";     var CN_SIX = "陆";     var CN_SEVEN = "柒";     var CN_EIGHT = "捌";     var CN_NINE = "玖";     var CN_TEN = "拾";     var CN_HUNDRED = "佰";     var CN_THOUSAND = "仟";     var CN_TEN_THOUSAND = "万";     var CN_HUNDRED_MILLION = "亿";     var CN_SYMBOL = "";     var CN_DOLLAR = "元";     var CN_TEN_CENT = "角";     var CN_CENT = "分";     var CN_INTEGER = "整";      // Variables:     var integral;    // Represent integral part of digit number.     var decimal;    // Represent decimal part of digit number.     var outputCharacters;    // The output result.     var parts;     var digits, radices, bigRadices, decimals;     var zeroCount;     var i, p, d;     var quotient, modulus;      // Validate input string:     currencyDigits = currencyDigits.toString();     if (currencyDigits == "") {         alert("你没有输入，请输入数字");         return "";     }     if (currencyDigits.match(/[^,.d]/) != null) {         alert("你输入的不是数字，请输入数字");         return "";     }     if ((currencyDigits).match(/^((d{1,3}(,d{3})*(.((d{3},)*d{1,3}))?)|(d+(.d+)?))$/) == null) {         alert("你输入的汉字是非法格式，请重新输入!");         return "";     }      // Normalize the format of input digits:     currencyDigits = currencyDigits.replace(/,/g, "");    // Remove comma delimiters.     currencyDigits = currencyDigits.replace(/^0+/, "");    // Trim zeros at the beginning.     // Assert the number is not greater than the maximum number.     if (Number(currencyDigits) > MAXIMUM_NUMBER) {         alert("你输入的太长了");         return "";     }      // Process the coversion from currency digits to characters:     // Separate integral and decimal parts before processing coversion:     parts = currencyDigits.split(".");     if (parts.length > 1) {         integral = parts[0];         decimal = parts[1];         // Cut down redundant decimal digits that are after the second.         decimal = decimal.substr(0, 2);     }     else {         integral = parts[0];         decimal = "";     }     // Prepare the characters corresponding to the digits:     digits = new Array(CN_ZERO, CN_ONE, CN_TWO, CN_THREE, CN_FOUR, CN_FIVE, CN_SIX, CN_SEVEN, CN_EIGHT, CN_NINE);     radices = new Array("", CN_TEN, CN_HUNDRED, CN_THOUSAND);     bigRadices = new Array("", CN_TEN_THOUSAND, CN_HUNDRED_MILLION);     decimals = new Array(CN_TEN_CENT, CN_CENT);     // Start processing:     outputCharacters = "";     // Process integral part if it is larger than 0:     if (Number(integral) > 0) {         zeroCount = 0;         for (i = 0; i < integral.length; i++) {             p = integral.length - i - 1;             d = integral.substr(i, 1);             quotient = p / 4;             modulus = p % 4;             if (d == "0") {                 zeroCount++;             }             else {                 if (zeroCount > 0)                 {                     outputCharacters += digits[0];                 }                 zeroCount = 0;                 outputCharacters += digits[Number(d)] + radices[modulus];             }             if (modulus == 0 && zeroCount < 4) {                 outputCharacters += bigRadices[quotient];             }         }         outputCharacters += CN_DOLLAR;     }     // Process decimal part if there is:     if (decimal != "") {         for (i = 0; i < decimal.length; i++) {             d = decimal.substr(i, 1);             if (d != "0") {                 outputCharacters += digits[Number(d)] + decimals[i];             }         }     }     // Confirm and return the final output string:     if (outputCharacters == "") {         outputCharacters = CN_ZERO + CN_DOLLAR;     }     if (decimal == "") {         outputCharacters += CN_INTEGER;     }     outputCharacters = CN_SYMBOL + outputCharacters;     return outputCharacters; }